Slag trough heat recovery device

The utility model provides a slag runner heat recovery device which comprises a telescopic cover, a circulating water pipe and a control assembly, and the telescopic cover is used for stretching out and drawing back in the extending direction of a slag runner and covers the top of the slag runner when unfolded; the circulating water pipe is arranged in the telescopic cover, the circulating water pipe extends along the telescopic direction of the telescopic cover in a snakelike path, the water inlet end of the circulating water pipe is used for being communicated with a water source, and the water outlet end of the circulating water pipe is used for being communicated with an energy distribution procedure; the control assembly is arranged at the water outlet end of the circulating water pipe and comprises a flow meter, a pressure gauge and a thermometer which are sequentially arranged. The circulating water pipe in the slag trough heat recovery device is heated by slag, so that internal circulating water is ut